In the second post of this series I will introduce you to the mineral Fluorine.
It is a crystal form of a compound called calcium fluoride CaF2 .
The pure mineral is colourless but because of impurities it can have some beautiful colours (copper impurities make it green, cobalt blue).
It defines the hardness level of 4 on the Mohs scale, and it is quite brittle.
The comon uses in the industry are :
The use as a flux (flux is a or a mixture of additives that make iron slag flow better)
For the production of hydrofluoric acid
Jewelry and optics for special needs
In the end the photos of this mineral in my collection, enjoy.
